ADU Rules in Stockton, CA (2026)
ADU rules, permit requirements, size limits, and fees for Stockton, CA. Source-cited from official municipal code.
Yes, ADUs are allowed in Stockton, CA.
Stockton, CA permits accessory dwelling units (ADUs) on residential properties. ADUs — also called granny flats, in-law units, backyard cottages, or secondary suites — are secondary housing units on a single-family or multifamily lot. California state law actively preempts local restrictions, making ADU approval a streamlined ministerial process. In Stockton, the local building department handles ADU permit applications. Below you will find the current size limits, setbacks, fees, and timeline for building an ADU in Stockton.
ADU Size Limits
ADU Size Limits in Stockton: Detached ADU: up to 1200 sq ft (max height: 16 feet). Attached ADU: size varies by zoning — see official source. Junior ADU (JADU): up to 500 sq ft — must be within the existing primary dwelling or accessory structure. Detached ADU maximum 1,200 sqft per California Gov Code §66314(d)(5) (Stats. 2024 Ch. 7 §20). JADU maximum 500 sqft within existing space of primary structure per Gov Code §66333 (Stats. 2024 Ch. 7 §20). Stockton's RL (Residential Low) and RM (Residential Medium) zones have varied lot sizes — many Stockton residential lots are 5,000-8,000 sqft, adequate for detached ADUs. Stockton's lower home values mean ADU construction costs can exceed property equity in some cases — careful financial analysis recommended. Stockton Development Code Title 16.
| Type | Max Size | Max Height |
|---|---|---|
| Detached ADU | 1200 sq ft · Verified June 7, 2026 · Source | 16 feet · Verified June 7, 2026 · Source |
| Attached ADU | See official source | See official source |
| JADU | 500 sq ft · Verified June 7, 2026 · Source | Within existing structure |
Permit Fees
ADU Permit Fees in Stockton: Plan check fee: Varies. Building permit fee: Varies. Impact fees: None. School fees: None or N/A. Total estimated permit cost: Varies.
| Fee Type | Amount |
|---|---|
| Plan Check | $300–$1,500 |
| Building Permit | $600–$3,000 depending on valuation |
| Impact Fees | None |
| School Fees | Exempt for ADUs under 500 sqft. Stockton Unified School District development fees apply for ADUs 500+ sqft. |
| Total Estimate | See official source |
Permit Timeline
Stockton ADU Permit Timeline: The permitting agency shall either approve or deny the application to create or serve an accessory dwelling unit within 60 days from the date the permitting agency receives a completed application if there is an existing single-family or multifamily dwelling on the lot. Apply through the local building department online permit portal. Phone: (209) 937-8444.
Setback Requirements
ADU Setback Requirements in Stockton: Front setback: follows zone standard. Side setback: 4 feet. Rear setback: 4 feet.
Parking Requirements
Parking Requirements: Parking requirements have not been confirmed — see official source.
Restrictions & Requirements
- ADU must comply with Stockton Development Code Title 16 objective standards
- ADU cannot be sold separately from primary dwelling (unless Urban Lot Split per Gov Code §66411.7 applies)
- ADU must have permanent foundation
- San Joaquin Valley Air Pollution Control District (SJVAPCD) construction rules apply
- Stockton's Delta waterways and floodplain create unique siting constraints in some areas
How Many ADUs Are Allowed?
Number of ADUs Allowed in Stockton: Single-family lots: not confirmed — see official source. Multifamily properties: not confirmed — see official source.
- Single-Family Lots
- 1 ADU + 1 JADU per single-family lot
- Multifamily Properties
- Up to 25% of existing units (minimum 2) as detached ADUs; internal non-livable space conversions per unit
Statewide Preemption
ADU Preemption
California state law preempts local ADU rules — local governments cannot impose stricter standards.
View California preemption detailsState Law & Preemption
State Preemption: CA state law preempts local ADU restrictions. Stockton must approve compliant ADU applications by right.
Frequently Asked Questions
Can I build an ADU in Stockton?
Yes. Stockton, CA allows accessory dwelling units. On a single-family lot you can build 1 ADU + 1 JADU per single-family lot.
How big can an ADU be in Stockton?
The maximum size for a detached ADU in Stockton is 1,200 square feet. A Junior ADU (JADU) can be up to 500 square feet.
How long does it take to get an ADU permit in Stockton?
The typical ADU permit timeline in Stockton is The permitting agency shall either approve or deny the application to create or serve an accessory dwelling unit within 60 days from the date the permitting agency receives a completed application if there is an existing single-family or multifamily dwelling on the lot.. Total estimated permit fees are $1,200–$5,500 total permit fees.
Do I need extra parking for an ADU in Stockton?
Stockton parking rules for ADUs: No additional parking required for ADUs within one-half mile of San Joaquin RTD bus routes or transit hubs. No replacement parking when garage converted to ADU. Per California Gov Code §66322(a)(1) and §66314(d)(11) (Stats. 2024 Ch. 7 §20).
Do I have to live on-site to have an ADU in Stockton?
Owner-occupancy requirement in Stockton: No additional standards, other than those provided in Section 66314, shall be used or imposed, including an owner-occupant requirement.
Source: Stockton Municipal Code Title 16 (Development Code); California Government Code §§66314–66333 (Stats. 2024 Ch. 7 §20). Last verified April 6, 2026. View source